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Question

# We have two electric dipoles. Each dipole consists of two equal and opposite point charges at the ends of an insulating rod of length d. The dipoles sit along the x-axis a distance r apart, oriented as shown in figure. Their separation r >> d. The dipole on the left:

A
will feel a force to the left
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B
will feel a force to the right
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C
will feel a torque trying to make it rotate counterclockwise
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D
will feel no torque
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Solution

## The correct options are C will feel no torque D will feel a force to the leftAccording to questionE1 and E2 are the electric fields due to dipole (1) so E1>E2Force on dipole (2): qE1(left)+qE2(right)=q(E1−E2)left.Dipole (2) will not experience any torque, because lines of action of both forces are same.

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